Anti-abortion groups vow to fight Ben Nelson's reelection

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Republican leaders in the Senate have reportedly asked Nebraska Gov. Dave Heineman (R) to consider entering the race, which would all but ensure a Republican victory in 2012. And Crossroads GPS, a conservative outside group, is spending one-half million dollars in television ads attacking Nelson.

A message left with National Right to Life asking whether the group seeks to deter Nelson from running again was not immediately returned.